Granata japonica is a species of sea snail, a marine gastropod mollusc in the family Chilodontaidae.
(Original description by Adams) The brown, convex, imperforate shell has a suborbicular shape. It is transversely costulate. The riblets are close-set, and noduled. The interstices are very finely longitudinally striated. The spire is rather prominent. The rounded whorls are costate. The subcircular aperture is pearly within.
This marine species occurs off Japan.